Kill service_test.cc tests in favor of dart tests for the service protocol.

runtime/observatory/tests/service/contexts_test.dart

Index: runtime/observatory/tests/service/contexts_test.dart
diff --git a/runtime/observatory/tests/service/contexts_test.dart b/runtime/observatory/tests/service/contexts_test.dart
index 7928a74132b370443b21ae84f39ac7836664e7bc..ffbbb79c98bf9992a063d1c071d05c5efcffdbb0 100644
--- a/runtime/observatory/tests/service/contexts_test.dart
+++ b/runtime/observatory/tests/service/contexts_test.dart
@@ -1,7 +1,7 @@
 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override --checked
+// VMOptions=--compile-all --error_on_bad_type --error_on_bad_override
 
 library inbound_references_test;